Improvement in sewing-machines



Patented MQay 27. 1873.]

AM. Moro-mummia ca Andiamo/:yds macsss) Sewing-Machines.

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Par'emed- May 27; \a73.

AM. eHommHosR/xfH/c co. :xwoman/ele mams) tached to the said pinion N UNITED STATES PATENT OFFICE- IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 139,245, dated May 27,1873; application died February 21, 1873.

To all whom it may concern: Be it known that we, THOMAS HENDERSON, of the city oi' Hamilton, in the county of Wentworth, in the province of Ontario and Dominion of Canada, and WILLLAM G. WRIGHT, of the same place, have invented certain Improvements in Sewing-Machines; and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the saine.

Our invention consists in arranging within a circular race a shuttle, to which is imparted a continuous rotary motion, and with which is combined a thread-shifter, operated by suitable mechanism, whereby the shuttle-thread is moved to the right and left of the shuttle as the latter revolves in its race, by which arrangement the usual twisting and untwisting of the threadare prevented.

By reference to the annexed drawing it will be seen that, Figure 1, sheet I, is a front view of our improved sewing-machine. Fig. 2 is a top view of the shuttle. Fig. 3, Sheet II, is a side View of a portion of the machine.

A represents the head of the machine, B the arm broken oli, O the shaft for driving the heart motion, D is the needle-bar, E the needle, F the cloth-plate, G the shuttle-race, constructed as shown, with the shuttle H at the top of it. Irepresents the shuttle-carrier, secured on the driving-shaft Q. On the same 'shaft is keyed a small pinion, O, and immediately below it is a larger gear, N, which is keyed to a shaft or spindle from the projectionl?, and which moves or revolves with onehalf the speed of the upper pinion. At-

is a cam, L, a side view of which is seen in Fig. 3, and a full front view in dotted lines in Fig. 1, the revolution of which imparts an oscillating movement to the hooked thread-shifter and take-up J, by means of the horizontal bar K pressing upward against it. The said threadshifter is fastened to the base or bed of the machine by the screw M. One-end of a small ila-t spring, s, is fastened to the race G, and its opposite end pushes out the thread-shifter, as shown in Fig. 1. The shuttle-thread is carried into a vertical groove, Y, in the shuttlerace. Prepared for it, and at each alternate revolution of the shuttle, the cam L operates the hooked take-up, which catches the thread and draws it outward and slackens it again at the instant when necessary. The shuttle thus passes to the right and left of its own thread without injury to the `twist of the thread.

The shuttle is held in the shuttle-race by the shuttle-carrier I, which is keyed on the end of the shaft Q. The peculiar form and construction ofthe shuttle are seen in Fig. 2, Sheet I; the top of it is of a circular form, to correspond with and fit the circular race G. It is threaded from the lower side. A curved portion of the shuttle-carrier enters the notch b in the shuttle and holds it securely in its place. The arrows show the direction of the shuttle. When it is necessary to remove the shuttle from the race for the purpose of threading the bobbins, Ste., it may be taken out through an openingin thel cloth-plate, which will be immediately over the top of the race and covered with a slide; or it may be taken out from the back of the race by removing a spring from the shuttle-carrier; or it may be removed from thefront of the race and covering it with a slide.- y

The cloth-plate a is secured to the machine by two screws, c and d, so that it can be easily removed to clean the parts without interfering with any of the working machinery underneath it. None of the said parts are connected to the cloth-plate.

In order to keep the thread off the oil, we purpose to carry the thread from the spool to an eyelet, T, on the top of the head A thence downward to the tension-washers S; thence upward to a projection, R, on the heart-ma tion, to an offset, D to the right on the bottom or" the needle-bar D. The thread may bel made to pass through a hole in `the said oHset or pass down by the side of it, as may be found convenient.

rlhe advantages of our machine are: It runs smooth, without much vibration. The arrangement of the take-up or thread-shifter prevents the thread from untwisting.`

What we claim as our invention, and desire to secure by Letters Patent, is-

which slides in a slot, e, and from that vshifter J, and spring s, in combination with l. A shuttle, H, arranged Within the circuthe cam L and gears N O, substantially as lar race G, and adapted to have a continuous and for the purpose specified. rotary movement, combined and operating in Hamilton, Canada, February 1, 1873. connection with the thread-shifter J, substantially as described, whereby the shuttle- THOMAS HENDERSON thread is moved to the right and left of the WILLIAM G' WRIGHT' shuttle as the shuttle revolves in its race. Signed in the presence of 2. The shuttle H, circular race G, thread- W. BRUCE,

W. B. BRUCE. 

